Lock construction



May 26, 1936. A SCHOOREL 2,042,026

LOCk CONSTRUCTION Filed Jan. :51, 1934 6 Sheets-Sheet 2 INVENTOR V Adam Schoq rel BY @QM HQMM A TORNEYS May 2 6, 1936. scHgb 2,042,025

LOCK -CONSTRUCTION Filed/Jan. 51, 1954 6 Sheets-Sheet 3 8 INVENTOR flolam Schoorel BY ATTORNEYS y 26, 1936. SCHOOREL 2,042,02

Locx CONSTRUCTION Filed Jan. 51, 1934 6 Shets-Sheet 4 Tic. E. T 11.1? Y

INVENTOR .Adam scfidorel BY /ATTORNEYS y 1935- A. SCHOOREL LOCK CONSTRUCTION Filed Jan. 31, 1934 6 Sheets-Sheet 6 INVENTOR flclam Schoov 61 Patented May 26, 1936 RINETEE STATES PATENT GFFHCE LOCK CONSTRUCTION York Application January 31, 1934, Serial No. 709,127

58 Claims.

This invention relates to lock construction and particularly to a construction for preventing unlocking of the lock after certain mechanism of the latter has been tampered with.

One of the objects of the invention is to provide a lock construction achieving a high factor of safety without complicating structural and manufacturing facility and more particularly to provide a lock construction of this character in which actuation of the mechanism in which boltwithdrawing direction is dependablyprecluded even though the key-controlled mechanism has been broken away or otherwise removed. Another object is to provide a lock construction of the above-mentioned character which will be of simple and thoroughly practical construction capable of reliability of action, rugged in construction, and dependab-ly tamper-proof. Another object is to provide a lock construction in which such objects as the above are achieved in a thoroughly practical manner and yet having its parts so arranged that ease and speed of assembly are dependably achieved. Another object is to provide a lock construction having such tamper-proof characteristics as above-mentioned but in which restoration of the construction for normal operation will be quickly and easily achieved. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which are shown several of the various possible embodiments of certain features of my invention,

Figure 1 is a vertical sectional view' through a door or the like and through the related lock and key-controlled mechanisms;

Figure 2 is a vertical sectional view as seen along the line 2-2 of Figure 1, showing in plan the internal mechanism;

Figure 3 is a vertical sectional view, as seen along the line 33 of Figure 2;

Figure 4 is a plan view of the closure or rear plate of the casing of the .lockmechanism;

Figure 5 is a view of the. right-hand portion of the apparatus, as seen in Figure 2, but with certain parts thereof in changed position; Figure 6 is a plan View of another embodiment of certain features of my invention, as seen from the rear and open endof the lock casing, the bolt mechanism being shown-in bolt-withdrawn -posi tion;

Figure 7 is a view similar to that of Figure 6, but it shows the mechanism in bolt-projected position; 5

Figure 8 is a vertical sectional view as seen along the line 88 of Figure 7;

Figure 9 is a view similar to that of Figure 7 but shown only in part or fragmentarily showing the relation of certain parts of the mechanism afterlO certain other mechanism has been tampered with;

Figure 10 is a vertical transverse sectional view showing the manual control;

Figure 11 is a Vertical sectional view on line H-II of Figure 6;

Figure 12 isa plan view of the back or closure plate of the lock mechanism of Figures 6-11 inclusive;

Figure 13 is a plan view as seen from the rear, with the cover removed, of another form of lock mechanism, with the parts in bolt-withdrawn position;

Figure 14 is a view similar to that of Figure 13, but showing the parts in bolt-projected position;

Figure 15 is a vertical sectional view through the lock mechanism of Figures 13 and 14 and through the door or like part with which the lock may be associated;

Figure 16 is a plan view of the rear or closure plate of the lock mechanism of Figures 13-15;

Figure 17 is a perspective View on an enlarged scale of one of the parts employed in the lock mechanism of Figures 13-15;

Figure 18-is a perspective view of an assembly plate of that look construction;

Figure 19 is a detached perspective view of one of the parts used in the mechanism of Figures 13-15, and

Figure 20 is a perspective view of another part of the lock mechanism of Figures 13-15.

Similar reference characters refer to similar parts throughout the several views of the drawmgs.

Considering first the lock construction shown in Figures 1-5, it is first to be noted that it includes a casing 20 shaped substantially as shown in the drawings whose side and end walls and front wall 28 are preferably integrally formed and which may be closed by a back plate 2| (Figure 4), the casing being provided with suitable holes 22 (Figure 2) and the back plate 2| with suitable cutouts 23 which register with the holes 22 for the reception-of suitable screws (not shown) for securing the casing to a door 24 (Figure 1) or the like.

Within the casing 25 is carried what I shall term a slide 25, the latter being conveniently in the form of a casting and being of substantial thickness and Weight in order tolend adequate strength; at its left-hand end, as seen in Figure 2, the slide 25 is shaped to provide two arms 262'i carrying at their ends plunger-like bolt members 28-29, respectively, preferably alined with each other and movable, with the member 25, transversely of the casing 23 and hence in a direction up and down as viewed in Figure 2.

The bolt members 2829 are adapted to coact with and to enter the eye members 30 and 3|, respectively, of a keeper structure 32 secured to the door frame or casing, the casing 20 extending beyond the edge of the door and thus overlapping the door frame and being provided with suitable apertures to permit the eye-like keeper portions 303| to enter into the casing 25. If, then, the slide 25 is moved upwardly, as viewed in Figure 2, and into the position shown in that figure, the bolt members 28-23 enter the eye members 30 and 3 I, respectively, and thus lock the door to the door frame.

The slide 25 is limited in its bolt-projecting movement by a projection 25 (Figure 2) thereon which rides into engagement with the side wall of the casing while its movement in bolt-withdrawing direction (downwardly in Figure 2) is limited by the engagement of portions 25 thereof with the opposite side wall of casing 26. Slide 25 is guided in this transverse movement relative to the casing 2!] by guideways 3 2 (Figures 2 and 3) suitably formed in both the slide 25 and the front wall 23 of the casing, and coacting with these guideways 32 is a lug 25 (Figures 2 and 3) projecting from the slide 25 and engageable in a transversely extending slot 2| (Figure 4) in the back or cover plate 2|, the thickness of the slide 25 being, moreover, as better appears in Figure 3, such that the spaced walls 20 2| receive the member 25 therebetween for easy guiding movement in the directions above described. The mounting or securing in place of the closure plate 2! will be described later.

For actuation of the slide 25 and hence of the bolt members 2829 in the direction above described, there are provided two actuating members 33 and 34 (Figure 1); member 33 is in the form of a double armed crank having two arms 33 and 33 and it is carried on the inner end of a sleeve 35 (Figure 1) of a handle or knob 36, sleeve 35 extending through the front wall 2|! for free rotation therein. The arms 33 --33 are shaped substantially as shown in Figure 1, being thereby engaged by the free end 31 of a spring 37 whose helical portion extends about a stud 38 (Figures 1 and 2) and whose other end 31' (Figure 2) rests against the end wall of the casing 23. Double crank 33 may therefore be manually rotated by the handle 36 for control of the lock mechanism from the inside of the door, spring 31 acting upon the arms thereof yieldingly and causing the crank arm and knob always to be returned to a position such as is shown in Figure 2.

Member 34 is in the form of a simple crank arm and is fixed to a bushing 39 (Figures 1 and 4) that is rotatably carried by the back plate 2| in axial alinement with the sleeve and knob 3536. Bushing 39 has a transverse slot.43 at its outermost face (Figures 1 and 4) for the reception of the actuating bar 4|, rectangular in cross-section, of the key-controlled mechanism generally indicated at 42, the latter being mounted in a suitable hole 24 in the door 24 and secured thereto as by the plate 42 (Figure 1) and screws 43, in a manner well known. The mechanism 42 is provided with any suitable tumblers, wafers, or the like, to be controlled by the key 44. Accordingly, upon the insertion of the proper key 44 from the outside of the door 24, the tumbler or like mechanism is set to permit rotation of the actuating bar 4| by the key 44 whereupon the single crank 34 may be rotated.

The sleeve 25 (Figure 1) is, as above noted, hollow so that the bar 4| may freely extend entirely through the lock casing and into the sleeve 25, thus making it unnecessary to have to out off or fit the length of the operating bar 4| where the latter might otherwise be too long.

Considering now the actuation of the slide 25 with its bolts in response to the' actuation of either of the cranks, it is first to be noted that the right-hand end (Figure 2) of the slide 25 is provided with extensions 25 and 25 having end faces inclined toward each other, but these extensions are spaced apart to slidably receive therebetween the block-like head 45 of a plunger 46 slidably received in a cylindrical channel 25 in the slide 25 (see Figure 2) Between the inner end of plunger 45 and the bottom of the hole on channel 25 is interposed a spring 41 which pushes the plunger 46 and hence the head 45 to the right, that action being limited by a screw 43 threaded into the side of the plunger 46 and whose head slides along the slot 25 in the slide 25.

As better seen in Figure 3, the head 45 projects beyond the slide 25 and virtually contacts the inner face of the closure plate 2|. The latter carries a block or lug 49 (Figures 3 and 4) positioned in what would, except for the movements hereinafter described, be the line of movement of the head 45 as it is carried transversely of the casing 20 with the slide 25.

With the parts in the position shown in Figure 2 (bolts projected), the head 45 engages at one side of the lug 49 and in the view shown in Figure 3 the head 45 will be seen to be abutting against the upper edge or side of the lug 49. This action precludes the slide 45 and hence the bolts from partaking of a movement in bolt-withdrawing direction (downwardly in Figure 2), lug 49 dependably blocking such movement.

However, should either of the cranks 33 or 34 be rotated, the crank arm swings in counterclockwise direction as viewed in Figure 2, past the inclined end face of extension 25 and into engagement with the end face of the head 45 but continued rotary movement of the crank arm pushes the head 45 and the plunger 46 to the left, thus displacing the head 45 from its abutting position with respect to the lug 49 (moving it to the right of lug 49 as viewed in Figure 4) Whereupon continued rotation of the crank arm to complete a 180 rotation thereof forces the slide 25 downwardly (as viewed in Figure 2) concluding the withdrawal of bolts 2829 from the keeper, and as the slide 25 reaches the opposite end wall of the casing so that the crank arm begins to move out of the space between the extensions 25 and 25 the spring 41 pushes the plunger 46 and head 45 to the right and upon the conclusion of these movements, the head 45 finds itself transposed to the opposite side or edge of the lug 49 (Figures 3 and 4) of the cover plate 2|, thus bringing about an abutting relation which now precludes unintentional movement of the slide 25 in bolt-projecting direction.

A' frequent mode employedby burglarsand the like of gaining access to..a locked door is, refer- .ringrnowtoFigurel, to cut or break away or .otherwise. remove the key-controlled mechanism I42 and to withdraw with. it the operating bar 4!,

Lthus exposing through the hole 24 in the door 24 or through the hole 42 in the securing plate 442 the transverse s1ot4i! (Figures 1 and 4) in the bushing 39 which controls the rotation of the crank arm 34; with that slot exposed, the insertion of .a screw driver or like implement therein .rotates the crank'54 and thus actuates the lock ..:mechanism to withdraw the bolts, whereupon it will be seen that access has been very easily and simply gained.

Aside from certain unique features already .above described, my invention contemplates the achievement of a thoroughly practical and relliable means for precluding the attainment of ..20:unauthorized access in a manner like that just .idescribed and accordingly I provide in the casing 0 (Figure 2) a stud .or post 55 preferably in- .tegrally cast or formed with the casing 25, the post50 extendingat right angles to the front -.wall 2fi pivoted on this stud is a member 5! havingtwo arms .5! and 5N, member 5! being biased to swing in clockwise direction by a spring :52 whose helical portion extends about the stud :52 whose one end rests against the side wall of casing 25 and whose other end rests against a projection 5! of the member 53, as is well shown in Figure 2.

Thearm 5! of the member 5!, shaped as indi cated in Figure 2, bears against the inwardly projecting portion of the operating bar 4! as appears clearly froml igures 1 and 2, spring 52 tending ealways to hold the member 5! against the operating bar 4! even during the rotation of the latter and being of sufficient strength to move it past ,40 the position shown in Figure 2 assuming that the "operating bar 4! is removed.

The other arm 5! extends in the space between the extension. 25 and an extension 25 which carries the motion-limiting projection 25 (Figure 2),

A5 the side face of extension 25 being slotted. as at 25 if necessary, to better accommodate the arm 5l The right-hand ends of the extensions 25 and 25 as viewed in Figure 2, are slotted, the slot being of sufficient thickness to receive the plate-like arm 5 l of the member 5! if the latter were swung in clockwise direction, as viewed in Figure 2, while the side face of extension 25 of the slide 25 (Fig- .ure 2) carries a latch member 53 which conven- 5 iently is in the form of a leaf spring, hook-shaped at its right-hand end and suitably secured, prefer- .ably in a slot in the side of the member 25, as by a screw 54. The extreme lower end of the arm 5! is shaped as indicated at 5i (Figure 2),

50 having an under face that is cam shaped or suitably curved to cause the hook-shaped end of the spring 53 to yield and having an opposed surface with which and over which the hook-shaped end 'of the spring 53 may engage.

65 Assuming now that the lock mechanism is in bolt-projected position (with all of the parts in the position as shown in Figure 2) and assuming now that the operating bar 4! is withdrawn for example in a manner like that above de- 7 scribed, bar 4! (Figures 1 and 2) no longer is in'position to hold the member 5! in the posi tion shown in Figures 1 and 2 and hence spring .52 is now free to snap or spring or move the member .5! in clockwise direction. This move- .75 ment results in the arm-5! entering the slots in the ends of the extensions 25 and-25 and in the yieldable latch member 53 being snapped over the locking portion 5! (see now Figure 3), latch 53 thus securely holding the member 5! against movement in counter-clockwise direction.

In that position, the arm 5% of member 5! engages against the inner face of the extension 25 (see Figure 5) and hence, with the member 5! locked against swinging movement by the latch .53 and being carried by the stud 5!] of the casing 20, the extension 25 (Figures 2.and 5) and hence the slide25 is blocked, independently of the plunger head 45, against movement, (downwardly as viewed in Figures 5 and 2) in bolt-withdrawing direction. Or viewed ina different light, the arm 5! in the positionshown in Figure 3 forms a relatively fixed abutment and between it and the side wall of the casing .120 is held the extension 25 of the slide 25, the latter being thus held against movement.

The plunger head 45 is also slotted to accommodate the arm 5!' of the member 5!, the slots 25 ,45 and 25 in the members 25 ,'45 and 25 (see Figures 3 and 2) being in alinement for the reception of the arm 5i fore, does not, in its clockwise movement from the position of Figure 2 to the position of .Figure 3, move the plunger head 45 to the left, so that the plunger head 45 remains in abutting The arm 5! thererelation to the lug 49 (Figures 5 and 4) on the closure plate 2!.

It is particularly to be noted that by the withdrawal cf the operating member 4!, the arm 5! of the member 5! is, in the manner above de-' scribed, swung to the left of the axis of the bushing 39 (Figure l) as these parts are viewed in Figures 2 and 5; that is, the arm 5! is held to the right of operating bar" 4! by the latter so long as the latter remains inserted but whenit is once withdrawn, arm 5! swings over to the left (see now the position in Figure 5) so that if a screw driver, bar, or other implement is now inserted through the slot 45 in bushing 39 in the endeavor to efiect operation of the lock mechanism in bolt-withdrawing direction, arm 5! b is now to the left of such implement.

Assumethen, that such implement has been inserted and its rotation commenced so as to swing the crank arm 34; crank 34 swings (see.

Figures 2 'or 5) past the inclined edge of the extension 25 and into engagement with the plunger head 45, moves the plunger'head 45 out of engagement with the lug 49 (Figures 4 and 5) and continued rotation of the arm 34 commences a downward movement of the slide 25; but such downward movement of the slide 25 operates upon the arm 5% (Figure 2) of the member 5! and starts swinging the latter in counter-clockwise direction, disengaging its portion5! from the spring latch 53, but now continued counter-clockwise swinging of the member 5! is precluded by the inserted implement itself against which the arm 5! is thus made to abut. It will be noted that now continued movement of the slide 25 is precluded for such movement cannot be carried on without continued counterclockwise swinging of member 5! andsuch swinging is positively blocked by the inserted instrument itself. Thus, such tampering and such attempted unlocking of the lock mechanism are fruitless.

Should the thus inserted and now ineffective implement be withdrawn, spring 52 rotates the member 5! inclockwise direction (as viewed in Figure 2) and such rotation reverses the partial movement of which the slide 25 had partaken, spring 4'! snapping the plunger head 45 back into abutting relation with respect to the lug 49 while latch portion 5| of member 5| reengages the spring latch 53, thus restoring the parts to their normal or intended relation.

However, crank arm 33 (Figures 2 and 1) operated by the handle or knob 36 and hence operable from the inside of the door can be operated to move the slide 25 down in bolt-withdrawing direction, so that the lock mechanism may still be operated from the inside even though it has been tampered with as above typified. Moreover, this facility for operation from the inside is utilized when a new key-controlled mechanism 42 and a new operating bar 4| are put in place of the one that had been removed and. makes for speed of restoration of the lock mechanism in its entirety.

Thus, in reinserting a new operating bar 4|, the handle or knob 36 is rotated to move the slide 25 in bolt-withdrawing direction, such movement, as will now be clear, swinging the member 5| in counter clockwise direction, as viewed in Figures 2 or 3, and that movement is continued until the arm 5| has been moved to the right (as viewed in Figure 2 or 3) of the axis of the bushing 39 or bar-receiving slot 40, whereupon the new bar 4| is inserted through the slot 46 and, when the knob 36 is released and normal operation resumed, the new operating bar 4| is in the path of clockwise rotation of arm 5 l and thus the parts are in readiness for a repetition of the safeguarding action, when need therefor arises, all as above briefly outlined.

The post 50 about which the member 5| is pivoted has a threaded hole for the reception of a screw 55, the screw 55 passing through a hole 56 (Figure 4) in the closure plate 2| and thus securing the latter with respect to the casing 20, suitable lugs 51 (Figure 3) being appropriately distributed throughout the periphery of the side walls of the casing 29 to properly support the closure plate 2|, in coaction with the post 2|], in spaced relation (see Figure 3) from the front wall 26 Referring now to Figures 6-12 inclusive, I have there shown certain features of my invention in connection with and coacting with a different kind of bolt construction and bolt-operating mechanism. Referring first to Figures 6 and 7, there is a lock casing 60 having an end wall 6|) provided with two apertures 66 and 66, the apertures being generally circular so as to slidably support the rotatable bolts 6| and 62, respectively, but having portions cut out to receive the projections 6| and 62 of the bolts, the bolts being at their ends substantially T-shaped due to the provision of two of such projections one on each side. The keeper (not shown) is provided with similarly shaped bolt-receiving holes or apertures through which the T-shaped heads are first projected and relative to which the bolts are then rotated so as to prevent withdrawal of the bolts from the keeper.

The right-hand ends 6| and 62 of the bolts are rotatably supported in a front flange 63 of a main sliding plate 64 which is slidably supported and guided in ways 65 and 66 (Figures '7 and 8) for movement in the direction of the axes of the rotatable bolts 6 |62; the connection between the bolts and the flange or wall 63 of the sliding plate 64 is such that, though rotation of the bolts relative to the sliding plate 64 may freely take place, relative movement in the direction of the axes of the bolts cannot take place so that the bolts must partake of whatever sliding movement that the sliding plate 64 partakes of.

One of the bolts, such as bolt 6|, carries a lug 6| (Figure 6) whose under face, as viewed in Figure 6, bears against the upper face of a lug or projection 66 integrally formed with and within the casing 60, so that movement of the bolt 6| toward the left, as viewed in Figure 6, cannot be accompanied by rotation of the bolt until the arm 6| has passed over the lug 60 whereupon rotation of the bolt 6| may take place, arm 6| swinging down into the space between the lug 6|] and the front wall 66 and hence into the position shown in Figure '7.

On their adjacent side portions, bolts 6|62 are provided with so-called spiral but in reality helical slots 6 I and 62 and resting in these helical slots is a cross-bar 6! which is carried at the left-hand end of an arm 68 which passes through a suitable hole in the wall or flange 63 of the main sliding plate 64 and which is secured to or forms a part of an auxiliary sliding plate 69 which rests against the main slide 64 and is guided thereby, main slide 64 having side flanges 64 and 64 (Figure 6) between which the auxiliary slide 69 fits and by Which it is guided in its sliding movement relative to the main slide 64.

Auxiliary slide 69 is provided with a transverse guideway TU extending transversely thereof, being milled or cast therein (Figures 6, '7 and for slidably receiving a detent member 1| shaped in longitudinal cross-section, as is better shown in Figure 10 and in elevation as appears in Figures 6 and '7. While auxiliary slide 69 may move relative to the main slide 64 in the direction of the axes of the bolt 6 |62, the detent member 1| may partake of sliding movement in a direction transversely of the axis of the bolts.

The detent member H has a connection, to be presently described, with a crank member 12 (see Figure 10) which is mounted on the inner end of a hollow sleeve 73 rotatably mounted in the outer wall 6E] of the casing 60 and terminating in a handle or knob 14 whereby, the lock being mounted upon the inside face of the door, the lock mechanism may be manually actuated from within.

As better appears in Figure 10, the ways 6566 space the main slide 64 sufficiently from the wall 6|] of the casing as to allow ample space for the rotational movements given the crank arm 12; the latter, moreover, carries at its outer end a crank pin which extends through a slot 16 in the main slide 64, through a slot 11 in the auxiliary slide 69 and through a hole 18 in the detent member 1|; moreover, the crank pin 15 extends also through a hole in a plate-like lever or member 19 (see also Figures 6 and 7) which will be more clearly hereinafter described, and threaded into the crank pin I5 is a screw 80 which thus holds all of the parts through which the crank pin 15 passes in assembled relation with respect to each other as well as with respect to the casing 60.

The slot 11 in the auxiliary slide 69 extends transversely of the axis of the bolts 6|-62 and is of a uniform width to snugly receive the crank pin 76, thus causing the auxiliary slide 64 to partake of movement of translation in the direction of the bolt axis whenever the crank 12 is rotated by the handle 14. The slot 76 in the main slide 64, however, is shaped somewhat as is indicated in Figure 9 whereby, as will more clearly appear later, the main slide 64 and the crank pin 15 may partake of relative movement in the direction of the bolt axis.

Auxiliary slide 69 carries a stud 8| (Figure 6) aboutwhich extends a wire spring 82whose one end bears in a recess in the end face (the upper end as viewedin the drawings) of the detent member H, as is better shown in FigurelO, thus biasing the member H downwardly as viewed in the drawings and similarly biasing the crank arm 12.

The plate-like member I9, freely pivoting about the screw 8|! (Figures 6, 8 and 10) has secured thereto a leaf .springs83rwhose unanchored end extends into a slot (Figures 8 and 10) formed at :one end of the detent'll and is, moreover, of sufiicient length to extendf'out of thatislot andinto a slot formed in arr abutment 59 (Fig? ures 6, 7 and 9) in the auxiliary slide 69. Thus the spring 83 is made to bias or tend to force the .plate member: 19 always in clockwise direction, as viewed in Figures 6, 7 and 9, Clockwise movement of the plate 19in clockwise direction is limited by an abutment l I (Figures 6 andrlo) carried by the detent member l The functioning-and purpose of the member l9 and related parts will be described in. detail hereinafter.

The casing 50 'is provided-with suitable holes 84 for securing it to thedoor or the like and the casing is closed by aicover plate 85 (Figures 12' and. 8) having suitablecutouts 86to.permit the securing screws that go through the holes 84 to bypass "and it is provided with opposed holes 81 (Figure 12) adapted. to receive suitable screws threaded into lugs 88 (see Figure 6) formed upon the .inside of the casing 66, thus to secure the closure plate 85 in place, the latter, moreover, coacting to preventmovement of various of the parts within thecasing in a directiorraway from the outermost wall 68* (Figure 10).

The cover plate 85 has rotatably mounted therein abushing 89 provided with atransverse slot90'. to receive the operating bar 4| of a keycontrolled mechanism such as the mechanism 42 of Figure 1 and already above described. At'

the inner end of the bushing 89 (Figures 8 and 12) the bushing has secured thereto a crank arm 9| carrying a. projection 92, hereinafter termed a crank pin, whereby, when the key-controlled operating bar 4| is rotated and hence crank pin 92 is rotated, the above described bolt-operating mechanism"may be operated, this time, however, from the outside of the door.

The crank pin 92, when it is appropriately rotated, is adapted to operate upon the detent H and, coacting parts with results substantially identical tothoseresulting from a rotation of crank 72' (Figure 10) by the handle M, all as is about to be described. The operating bar 4|, however, extends well throughthe bushing 89 and into the casing 6|) (see Figure 8)., the detent' member 1| (see now Figure 10) being cut out as at N to permit the detent, as'it moves to the right or left as viewedin Figures 6 and 7, to by-pass the end of the operating bar 4|; moreover, the auxiliary slide 69 is also cut out or channeled as at 93 (Figures 6 and 7) the channel extending throughout a sufficient depth and length such that the inwardly projecting end of the operating bar 4| (Figure 8) is accommodated,

in the channel throughout the movement of the auxiliary slide 59 to the left as viewedin Figure 6 or to the right as viewed in Figure 7.

Various parts above described assume the position shown in Figure 6, when the bolts til and 62 are in withdrawn or retracted position, crank 12 assuming a dead center position (its axis being to the left ofthe screw 80 in Figure 6) and that in retracted position. Moreover, the detent member H is, under the influence of spring 82," held in lowermost position, as viewed in Figure 6, from which it will be seen that its end (lower end in Figure 6) is in abutting relation but to the right of alug or projection 6|] on the inside of the casing 66, this abutting relation blocking displacement of the bolts 6 |62 and related parts in a direction to the left, as viewed in Figure 6, Moreover, spring 82 holds the parts H and'the crank 12 in these positions.

Assuming now-that the knob M is rotated to swing the crank 12 and hence the crank pin 15-86 (see now Figure 6) in counter-clockwise direction, the first movement of the crank pin Mi -i3!)v results in lifting the detent l6 out of abutting relation from the lug 66 detent sliding upwardly in the ways or channels l0, further tensioning the spring 82.

Continued movement of the crank pin 86 effects conjoint movement of auxiliary slide 69 and main slide-64-in a direction toward the left, as viewed in Figure 6; member 19, of course, moving upwardly with the crank pin l80.' 6 |6Z partake of a similar motion of translation, toward the left, but rotation of the bolts during this portion of the movement is precluded because of the arm 6| (Figure 6) engaging and sliding along the lug 60 within the casing 60, thus preventing relative movement between slides 69 and 64 inasmuch as relative-movement between the helical slot 6 N in the bolt 6| and the cross-bar 61 cannot take place without rotational movement of the bolt 6|.

As these movements are taking place, the innermost end of the operating bar 4| has the channel 93 (Figures 6 and 7) in the auxiliary slide 69 traversed relative to it, while the lever plate 19, still held by the spring 83 against the stop 'H as shown in Figure 6, is translated or moved in an are over (as viewed in Figure 6) the operating bar 4|.

As soon as the arm 6 on the bolt 6| (Figure 6) comes to the left of the abutment or lug 60 and substantially into the position shown in Figure 7, the bolt 6|; projected from the casing and now projected into the keeper, may partake of rota tion and such rotational movement thereupon takes place in that continued rotation of the crank 12 by knob 74 (Figure or under the influence of the spring 82 causes the auxiliary slide 69lto continue to move toward the left and into the position shown in Figure 7, relative to the main, slide 65 movement of which has ceased because now the arm 6| on the bolt 6| (Figure 8) abuts against the left-hand wall of the casing 60. This relative movement causes the cross-bar 61 to move lengthwise of the bolts Bl-BZ and the latter are, through the cam or helical slots 6| and 62 respectively rotated, thus bringing the T- shaped heads bl and 62 thereof (Figure 7) crosswise of the openings in" the keeper and thus definitely blocking withdrawal of the bolts from the keeper.

The crank pin -80 moves to a dead center position, this time to the left of the axis of the crank arm 12, being held in that position byrthe spring 82 and by thelimiting action of the slot T! in the auxiliary slide 69, slot 16 in the main slide 64 being suitably shaped tov permit the above-described relative movement between the two slides to take place. Moreover, detentmember H now becomes seated to the left of the abutmentl'ili (see Figure 7) and in coaction with the dead center relation securely holding'the parts Bolts ment 60 and in coaction with the dead center position of the crank pin 80, the detent 'II thus insures against forcing the now projected bolts in retrograde direction.

The latter portion of the above described movement of the crank pin 'I58Il ultimately brings the lower edge 19* (see Figure 7) of the pivoted plate member I9 into engagement with the operating bar 4| that projects into the channel 93 in the slide 60, and it is to be noted that the operating bar 4| precludes the member I9 from swinging in clockwise direction under the influence of its spring 83, all for a purpose to be about described.

The withdrawal of the bolts may take place under the control of the knob I4 by rotating the latter and hence the crank I2 in reverse direction, the above-described successive movements and actions taking place but now in reverse order, plate member I9 always riding up over, as viewed in Figures 6 and 7, the operating bar 4|.

Movement of the bolts from the retracted position of Figure 6 to the projected position of Figure '7 may, of course, also take place under the control of the operating bar 4| which, as above noted, actuates the crank arm 9| (Figures 8 and 12) and hence the crank pin 92. In that case, the crank pin 92 first strikes the portion I I (better shown in Figure 10) to start the upward (as viewed in the drawings) movement of the detent member I I, thereupon moving in between the upstanding flange 69 and the abutment or upstanding portion 69 (Figures 6 and '7) of the auxiliary slide 59, the parts I59 and 69 acting now virtually as a slot within which the crank pin 92 may function, a similar action taking place if the crank arm 9| is rotated in reverse direction to move the parts from the projected position of Figure '7 to the withdrawn position of Figure 6. In either case, the spring 82 acts to insure completion of the movements and to bring the crank 12 (Figure 10) into ultimate dead center position, and in either case, also, the lever plate I9 rides over (as viewed in the drawings) the operating bar 4 I.

If, however, assuming the bolts to beprojected and in the position shown in, Figure 7, the keycontrolled mechanism, such as the mechanism 42 of Figure 1, by which the operating bar 4| of Figures 6-10 is rotated, is tampered with or withdrawn so as to withdraw the operating bar 4| with the intent of substituting for it a screw driver or other implement or tool, it is first to be noted that, as better shown in Figure '7, the withdrawal of operating bar 4| amounts to withdrawing the member which stops further clockwise rotation of the lever plate I9 under the action of spring 83. With operating bar 4 I therefore withdrawn, spring 83 snaps the plate-like member I9 into a position relative to the auxiliary slide 69, as is shown in Figure 6, against a ledge 69 (see now the enlarged sectional view of Figure 11) at the lower right-hand corner of the auxiliary slide 69.

Projecting from the ledge 69 is a plunger 95 pressed upwardly by a spring 96, all housed in a recess 69* in the ledge 59 The right-hand lower face of the lever arm 19 is provided with a recess 19 (Figure 11) into which the plunger 95 is projected, thus properly alining the lower edge of the member relative to the remaining parts.

If, now, a screw driver is inserted through the slot 90 in the bushing 89 (Figures 8 and 12) and as is shown in Figure 9 where the screw driver S is projected through the slot in the bushing 89, and the screw driver S rotated to swing the crank action of arm 6 l 'in being to the left of the abutarm 9| in clockwise direction, as viewed in Figure 9, the resultant initial and partial upward movement of the detent member I I, substantially into the position shown in Figure 9, now brings the edge surface 19 of the lever plate I9 into contact with the screw driver or implement S, but this time at the under side thereof, as viewed in the drawings, and that action blocks further actuation of the mechanism in that direction, since the stop member or abutment II on the detent member II prevents clockwise rotation of the lever member 19 beyond the position shown in Figure 9, it being now apparent that the member I9 cannot now by-pass the screw driver S or be carried up and over it. Thus, unauthorized operation of the lock mechanism is precluded.

If, now, it is desired to restore the parts to normal, I need not take the lock mechanism apart or dismount it from the door or otherwise gain ure 6) is to occupy when a new bar and related key-controlled mechanism are associated with the outside portion of the door, whereupon the actions and operations above described may be repeated.

Turning now to Figures 13-18 inclusive, I have there shown a preferred form of certain features of lock mechanism, and referring first to Figures 13 and 14, I have provided a casing I00, in many respects similar to the casing 60 of Figures 6-12 whose left-hand end wall |0IF (Figures 13 and I4) is apertured as at IDIJ and 30, these apertures being circular to provide bearings for the slidable and rotatable bolts IOI and I02 but having lateral exposed extensions to receive the projections IIJI and IIIZ (Figure 14) of the bolts IOI and |02, respectively, when the bolts are in the withdrawn position as shown in Figure 13. The opposed projections I 0 I and I02 on the bolts I 0| and I02 virtually give the bolts a T-shape, as was above' described in connection with Figures 6 and '7, the keeper into which the bolts are projected being provided with holes shaped the same r as the holes or apertures I00 and IIIIJ of the end wall Ifiiii (Figure 13) so that the left-hand bolt ends may enter into the keeper and through the holes in the end plate thereof, whereupon, when the bolts are rotated, the lateral projections on the ends of the bolts take in back of the end wall of the keeper and thus prevent separation of the bolts from the keeper.

The right-hand ends of the bolts IOI and I02 are provided with shanks I03 and I04 (Figure 13) that are cylindrical but of smaller diameter than the bolts IOI and I02, respectively, the shanks I03 and I04 terminating at their right-hand ends in heads I05 and I05, respectively. These heads I05 and I05 are substantially cylindrical and are received in cylindrical recesses I01 and I08, respectively, in a slide block generally indicated at I 09 and better shown in perspective in Figure 17.

The cylindrical recesses I01 and I08, which may be cast or drilled into the left-hand end wall of the slide block I09, thus form bearings for the right-hand ends of the bolts IOI and I02, respectively, whereby these ends of the bolts are supported for rotation but it is to be noted that the bearings recesses IIJII08 are of materially greater;:length thanare the axial. lengths of the cylindrical bearing heads IB5'IB6 (Figure 13) so that relative movementbetween. these heads (andhence the bolts) and the slide block I99 may take place, all for a purpose tobe more clearly described hereinafter.

The bolts.I9I-I92 (FigureslS'and 14) are provided with helical (sometimes erroneously called spiral) slots IIiI and 32 respectively; similar to the helical slots 6| and 92 above described in connection with Figure 6, the directions in which thesehelical slots extend relative to the respective axes ofthe two bolts being opposite to each other.

Into these slots IIlI I02 extend the respective ends of a cross-head or cross-barI In (Figure 13) carried by an extension III directed forwardly (to the left in Figures 13 and 14) of the slide block I69 and preferably integrally formed therewith. This extension III with the crosshead or cross-bar I I9 appears clearly in Figure 17.

The left-hand end I99 of'the slide block I2 5, being the end into which the cylindrical bearing recesses [Ill-I08 are formed, is provided with dovetailed grooves II2II3 extending vertically (see Figure 1'?) and at the side ends of the otherwise plane end face of the end I99 of the slide block I99. These dovetailed grooves IIZ-I I3 slidably receive and hold the correspondingly shaped vertical flanges II4I ifs-(see Figure 18) of a plate member I IS, the parts being soshaped that the front face of the plate MS, as viewed in Figure 18, lies flush against the face or the end I99 of the slide block. Moreover, the plate IIS (Figure 18) has a central slot Ill in which the extension III is accommodated when the plate H6 is slid down into place. As the latter movement takes place, slots H8 and H9 .in the plate H6 (Figure 18) one on each side of the central slot Ill, take over the shanks IIiS-Iild; respectively, of the bolts IIlI-I'Il2 (see Figure 13), and since the width of the slots I I8I I9 is less than the diameter of the heads [95-496 of the bolts, the bolts are thus held in assembled relation with respect to theslide block I09 but, it is to be noted, in such a manner as to permit rotation of the bolts relative to the slide block I99 and also to permit relative sliding movement between the bolts and the slide block I99, the latter movement being of a magnitude substantially equal to the length of the shanks III3I95 (see Figure 13). The dovetailed interfitting of the plate IIE with the slide block I09 is preferably one approaching a force-fit so that the relatively tight interfitting holds the assembly plate H6 in place. Thus rapid assembly is made possible and also ease and rapidity of disassembly should repair or replacement be necessary.

The slide block I99 is slidably mounted in the casing I98, the longitudinal side walls of the latter being suitably shaped or formed to provide lengthwise extending and opposed Ways I20 and I 2i (see Figures 13, 14 and 15) and the sliding movement of the slide block I09 may be controlled by either of two cranks or crank elements, as is described in detail hereinafter.

One of these crank arms is the sheet metal arm I22 (Figures 14 and 15) suitably and rigidly secured to the inner end of the tubular shank I23 of the end knob I24 rotatably supported in the outer wall lilii oi the casing I99, this knob construction being not unlike the knob constructions 3536 of Figure 1 and 'I3'I4 of Figure 10, all being hollow. The end of the crank arm I22 has secured to it a crank pin or stud I25 (Figure 15) and is adapted'to cooperate with certain; parts related to the slideblock. I(I9(Figure.17), being accommodated during its swingingmovement in the transverse slot I29 in the slideblock.

The slide block I69 (Figure-17) has a-central 5 longitudinally extending slot I21 ranging from its right-hand end toward the left-hand end, as viewed in Figure 17. thus virtually biiurcatingthe slide block I99. Extending transversely of the slide block I99 are ways I28 (Figure 17) in which 10 is guided for transverse sliding movement a member I29 having an elongated base portion I29 which is interfitted with the undercut or dovetailed guideways I29 of the slide block I 99 and an upstanding part or head I29 (see Figures 19, T57; 14 and 15). The transverseslot I28 (Figurel?) underlies the guideways I28 and thus underlies the transverse sliding member I 29; however, crank pin or stud I29 (Figure 15) projects upwardly in the slot I28 (Figure 17) and to that stud I25 the base portion Itt of the member I29 is secured as by a screw I32, more clearly described hereinafter.

Slide block I99 (Figure 17 and also Figures 13 and 14) is cut out as at IBI in a downward direction but not throughout its entire depth or thickness, and in this cut out portion IiiI there is mounted a stud I32 about which is coiled a spring I33 whose one end (see Figures 13 and l4) bears against the side face of the slideblock I98 and whose other end bears against'the head I29 of the transverse sliding member I29; the spring I33 acting toforce the member I29 in a downward direction, as viewed in Figures 13 and 14.

With this arrangement, and assuming that the bolts IIIll2 are in withdrawn position (Figure 13) the crank I22 of the knob I24 (Figure 15) is in dead centerposition to the right of the axis of the tubular shank I29 of the knob, spring I33 4 (Figure 13) insuring'the maintenance of this position in that itacts upon the crank I22 through the slide member I23, the latter being secured to the crank pin or stud I22 by screw I39. In fact. the parts are so constructed that preferably, during this position, the stud or crank pin I25 bears against one of the side walls of the central longitudinal slot I21 (Figure 1'7) in the slide block I89.

If, however, the knob IZfiis rotated to swing. the crank I22in counter-clockwise direction, as G I} viewed in Figure 13, the crank pin I25 starts to move upwardly against theaction of spring I33 and into the transverse slot I26 (Figure 17) of the slide block W9, slide member I 29 movingupwardly, as viewed in Figure 13, along the guide- 00'' ways I28; and as the crank swings in counterclockwise direction, the slide block. I09 starts to move in a direction toward the left, as viewed in Figure 13, imparting a similar motion of transc lation to the bolts HIM-I92, the latterbeing precluded from partaking of i rotation during this stage of movement.

In this latter connection, it is to be noted that the bolt I Ill is provided with a lug. I91 which. bears against a ledge- I3 3" extending lengthwisewithin the casing I99, the ledge I34 terminating short of the left-hand end wall I93 of the casing IIlII by a distance substantially equivalent to the width of the lug Iill on the bolt IUI. This lug I9I therefore, prevents-rotation of bolt IGI until the latter has partaken of a motion of translation in a direction toward the left (Figure 13) until the lug IIJI comes to the point where it is ready to ride off of the ledge I34. By this time the crank I22 has partaken of a rotation of approximately 90 in counter-clockwise direction from the position shown in Figure 13.

The other bolt I62 is prevented from rotation by a somewhat analogous construction in that it is provided with a side lug I82 (Figure 13) whose flat end face slides along one of the surfaces forming the guideway I2I for the slide block I59, that surface terminating, as at 535, short of the end wall Hill of the casing by a distance substantially equal to the width of the lug Hit! of the bolt I 82. Here again bolt I132 partakes of movement of translation without rotation in a direction to the, left throughout such a distance as will bring the lug H12 in the position where it is about to ride off of the guideway surface that terminates at I35, this taking place substantially simultaneously with the riding off of the ledge I34 of the lug IfiI of the other bolt IBI.

During this motion of translation, therefore, the force effecting such movement is transmitted to the bolts from the slide block Hi9 through the extension III and the oppositely projecting arms IIB that engage into the helical cam slots IiiI and I32 (Figure 13).

As soon as the bolts I!!! and IE2 are released for rotation by the riding off of the respective ledges of their respective lugs, these lugs, excepting for a slight end player manufacturing tolerance, abut against the end wall mil of the casing I88 and now they act to prevent further motion of translation in a direction toward the left of the bolts iilII02, whereupon continued counter-clockwise rotation of the crank arm I22 throughout approximately the next 90 of its rotation causes further movement toward the left of the slide block I09, thus causing the opposed arms III) to move relative to the helical slots IIlI and 3?, thereby causing rotation of the bolts, the latter having already entered the keeper by the time the motion of translation has ceased, the subsequent rotation turning the bolt heads IlJI and Illll crosswise of the keeper holes and thus preventing withdrawal of the bolts.

During this last stage of actuation of the bolts in the course of which they are rotated, the slide block I 89 moves relative to the bolts IflIIi2; this relative motion is made possible by reason of the depth of the cylindrical recesses I87l88 in the slide block I69 and within which recesses the bolt heads IIl5--I06 are rotatably and slidably received.

The various parts above described and in their final or locked position are shown in Figure 14, the last 90 range of movement of the crank having been aided by the spring I33 which insures that the crank pin or stud I25 is brought into or beyond dead center position and hence held against that face of slot I2? (Figure 17) that is opposite the slot I26.

This dead center position aids in preventing forced retrograde movement of the bolt or bolts, either rotational or of translation. Furthermore, the bolt lugs IBI and I82 in having ridden off of the ledges I34 and I 35 as above described, now are in virtual abutting relation to the left-hand ends, as viewed in Figure 14, of these ledges, and thus aid in resisting any forcing of the bolt or bolts in retrograde or unlocking direction.

In withdrawing the bolt or bolts, the above described cycle of operations is virtually reversed; the knob I24 and hence the crank 922 are rotated in clockwise direction, as viewed in Figure 14, and during about the first 90 of this movement, the bolt lugs WI and IETZ prevent the bolts from following the resultant movement in a direction toward the right of the slide block I09, thus causing the latter to move relative to the bolt or bolts, in an axial direction, and thus causing the bolts to be rotated in reverse direction, bringing the bolt lugs IOI and I 02 out of their respective recesses and into position where they can slide along the ledges or faces which, as earlier described, were effective in preventing rotation. Having thus completed the reverse rotating of the bolts, the bolt heads IilE-lIlB become engaged by the plate H6 at the left-hand end of the slide block I 99 and which plate locks the bolt heads within the cylindrical recesses Isl-I83, whereupon movement throughout the next range of approximately 90 causes movement of translation of the bolts in a direction toward the right until the position of the parts as shown in Figure 13 is reached, the crank again going to dead center and thus dependably holding the parts in withdrawn position.

The above described actuation of the mechanism may also be achieved by means of a suitable key-controlled mechanism, more particularly, a key mechanism like that of Fig. 1 and which, for purposes of convenience has been reproduced in Figure 15; thus, referring to Figure 15, the casing IOU with its above described bolt and bolt-operating mechanism is shown in Figure 15 as secured, as by appropriate screws passed through'the'screw holes I35 (Figure 14) to the inside face of a door 24 in the hole 24a of which is secured the key-controlled mechanism 42 adapted to receive, from the outside face of the door, a key 44 by means of which the operating bar 4E may be rotated of course in response to the insertion into the key-controlled mechanism 42 of the proper key, mechanism 42 being secured in place by screws 43 and the back plate 42 as was described above in connection with Figure 1, the operating bar II passing through a suitable hole 42 in the securing plate 42*.

The casing it! is closed by a closure plate I37 (Figures 15 and 16) which is provided with holes I33 (Figure 16) through which suitable screws may be passed and threaded into the threaded holes i355 (Figure 14) provided in suitable shoulders or lugs upon the interior of the casing Ill. Moreover, back or closure plate I 37 is provided with suitable recesses it!) (Figure 16) to register with the holes I 35 (Figure 14) in the casing I00, thereby to permit the passage therethrough of the screws that secure the construction to the door 24 (Figure 15).

As is better shown in Figures 13 and 14, the casing I90 is provided with suitably distributed shoulders or ledges I l! lying in the same plane and against which the closure plate it! rests and against which it is held by the screws that pass through the holes 53-3 (Figure 16) in the plate I31 and that are threaded into the holes I39 (Figure 14) in the casing I59. Thus the closure plate I3! is held parallel to and spaced from the front wall wil (see Figure 15) of the casing I Ml, and takes part in holding the slide block I59 in assembled relation to the, guiding ways I2!) and IZI (Figure 15) along which the slide block I09 slides. More specifically, the front end I89 (Figure 17) of the slide block M39 is given such a vertical dimension that it snugly fits in between the ways I20-I2I and the closure plate I31, along which the upper face of the front end I09 of the block I09 (Figure 17) may glide. Also, the rear corner ends (Figure 17) of the slide block I09 are provided with upstanding lugs I42-I43 which are similarly dimensioned to just about contact with the closure plate I31 as slide block I09 slides along the ways I20-I2I, thus coacting to maintain slide block I09 in assembled relation to these guiding ways. The closure plate I31 has rotatably mounted in it a bushing I44 (Figure 16) provided with a rectangular slot I45 through which passes the operating bar 4| (Figure 15), bushing 44 being so positioned that its axis of rotation is coincident with the axis of the sleeve'123 and knob I24 (Figure 15); the latter parts'being -hollow, operating bar 4| (Figure 15) can andpreferably does extend not only through the bushing I544 but also into the sleeve I23 of the knob I24, it being noted that the longitudinal slot 121 (see Figure 11) in the slide block I03 is of such extent longitudinally and transversely that the operating bar 4| is freely accommodated therein through the range of movement of the slide block Against the inside face of closure plate I31 and secured to rotate with the bushing I44 is a crank I46 (Figures 15 and 16) provided at its outer end with a stud or crank-pin I 41, crank-I46 with its crank pin I41 being thus capable of being rotated by the key 44 (Figure 15) acting through the operating bar 4|, crank pi-nl41 being available to actuate the above-described bolt--operating mechanism.

Crank pin I41 may accomplish an actuation of the bolts as was earlier above described inconnection with the actuation of the bolts by the knob I24 (Figure 15) by the following arrangement:-Referring first to Figure 17, it will be recalled that there was above described the transverse ways I 28 along which the member I29 is guided and that member I29 (Figures '13 and 14) is connected by screw I30 to the crank pin I25 (Figure 15) of the crank I22 operated by the knob I24. To this may be added the fact that the dovetailed guiding ways I28 (Figure 1'1) in the slide block I09 are formed in the bottom of a transverse slot I48 which extendsto either side of the longitudinal slot I21, forming, to the right of the longitudinal slot I21, as viewed in Figure 17, two parallel spaced walls I49- -'I50 between which the head I29 (Figures 13, 1 4 and 15) of the member I29 moves as the member I29 is guided along the under-cut ways 12B by-its base portion I23? Moreover, the walls I49- -IIO are curved or cut away as at I49 and I50 (Figure 17) so that, with the parts in the position shown in Figure 13, a counter-clockwise rotation of the keycontrolled crank pin I41 (Figures 15 and 16) brings the crank pin just past the curved wall portion I50 (Figure 1'1) and into engagement with the head I29 (Figure 13), thereupon moving the slide member I29 against the action of spring I33 (Figure 13), at the same time, of course, actuating the knob-controlled crank pin I25 and crank I22 (Figure 15) which are connected to the slide member I29.

Key-controlled crank pin I 41 moves lpwardly, as viewed in Figure 13, into the slot I48 and between the walls I49I50 thereof (Figure 17) but at the same time a motion of translation in a direction toward the left (Figure '13) of the slide block I09 has taken place, crank I22 having been lifted out of its dead center position.

This motion of translation, as above described of the slide block I09 gives a similar motion to the bolts I0 II 02 until their parts I01 and I02, respectively, ride off of the ledges I34-I35, respectively, whereupon motion of translation of the bolts ceases while continued motion of trans- '5 lation of the slide block I09 rotates the bolts into the positions shown in Figure 14, key-controlled crank pin I 41 riding out of the transverse slot M8 in the slide block I09, past the cut away wall portion l49 (Figure 17), spring I33 (Figure 14) insuring that member 529 .is moved to such a position that the crank pin I25 (Figure 15) of the crank I 22 is again in dead center position. Thus, the bolts are thrown into the keeper and rotated, under the control of the key-controlled mechanism.

The key-controlled mechanism, if now actuated in reverse direction, puts the crank pin I41 (Figures 15 and 16) through a reverse or clockwise rotation as it would be viewed in Figure 14, whereupon the above-described steps are repeated but in reversed order, the mechanism finally being brought to the position of Figure 13 with the crank pin I25 of the crank I22 in its other dead center position.

Since the crank I46 (Figures 16-and1'5) is on the inner inside face of the closure plate I31, slide block I09 (see now Figure '17) is out out as at I5I so that, with the parts in the position shown in Figure 13, the crank I46 (Figure 16) is accom- 30 modated in this cut-out part I51. 7 7

Considering now, in connection with the structure of Figures 13-20, how I prevent operation of the bolt-operating mechanism by means of an implement inserted into the crank slot I 45 (Figure 16) in place of the operating member -4l, assuming that the intruderhas been able to remove the key-controlled mechanism -l42 (Figure 15) from the outside of the door 24, it is first to be noted, referring to Figure 13, that I provide a member I52 in the form of a plate-likearm (see also Figure 20) that rests upon the upper face of the base portion I 29 (see also'Figure 19) of the transverse sliding member I 29 and is-pivotally related thereto by being held under the head of 45 the screw I30 which, as above described, issuitably shouldered and is threaded into the crank pin I25 (Figure 15) whereby a free pivoting of the shank of the screw I30 relative to the-slide member I29 and relative to this member -l52 may readily take place. The holes for the shank of the screw I30 for members I29 and-{Hare shown in Figures 19 and 20 at I29 and I52. It will-be understood, of course, that "parts 152 and 12-9 may be related to crank pin I25 bya construc- 55 tion like that shown in Figure 10. Member-I52 is thus made to move with the member 42%, and the latter member, it will be recalled, igmoved either by the knob-controlled crank pin I25 (Figure 15) or by the key-controlled crank pin -I4'1 (Figures 15 and 16). i V

The head I29 of member I29 is under-cut as indicated at I29 in Figure 13-and as is better shown in Figure 19, to provide a housing for a spring I53 that encircles a. pin I54 that passes through the head portion I29 and through the under-cut or recessed part I29 of thehea'd in which the coiled part of the. spring 1531s accommodated; one arm of spring I53 bears against the member I52 whose edge I52 (Figure 20), with which the spring I53 contacts, is suitably slotted or grooved to maintain the'spring I53 always in contact or engagement with the memher 152. I

Spring 153 tends always to force'the member |5 2 :in'clockwise direction, as viewed in Figure 13, and base portion I29 (Figures 19 and 13) is provided with a shoulder I29 against which member I52 is held by spring I53, particularly during certain movements of the parts.

With the parts in the position shown in Figure 1 3,however, member I52 coacts with certain parts of the slide block i69. More specifically, referring now'to Figure 17, the lower corner portion of slide block I09 is shaped or cut out to provide a bottom portion I55 and an upper portion I56 spaced Vertically from each other by substantially the thickness of member I52 (see Figure 20) so that spring I53, with the parts in the position shown in Figure 13, insures that member I52 rides into the space or slot between portions |55|56 (Figure 17). Now 'member:|52 (Figure 20) is provided with an upstanding abutment I51 which abuts against the right-hand edge of portion |56 (see Figures 17 and 13) being held in thatrelation'by spring I53.

To insure an interlocking action between the member I52 and the slide block I09, the latter, turning now to Figure 17, is provided with a cylindrical bore I 58 which extends into the lower portion I55, thus forming an exposed half-cylindrical recess I59. In the bore I58 andrecess I59 is slidably received a cylindrical tumbler pin 69, better shown in Figures 15 and 13, being pressed upwardly, as viewed in these figures, by a spring |6| inserted into the bore I58 (Figure 17) and suitably held therein as by an end plug 562 (Figure 15). The under face of member I52 (see Figure 20) is shaped to have a half cylindrical recess I63 which, when member I521 is in the relation ,to slide block I09 as shown in Figure 13, mates with the half cylindrical recess I59 (Figure 17) in the slide block I09, forming a complete cylindrical extension of the bore I58; and it is into this extension that the tumbler pin I66 (Figures 13 and 15) is projected by the spring I6I, when this mating relation is achieved, tumbler pin I60 yielding against the action of spring |6| as the member I52 moves into the slot between the portions |55|56 (Figure 17) of the slide block I09.

The tumbler pin thus securely interlocks member I52 and slide block I09 against relative motion therebetween in the direction of the axis of the bolts |0||02 (Figure 13) all for a purpose hereinafter more clearly described.

The lower right-hand corner portion of slide block I09 (Figure 17) is also slotted to provide a bottom portion I64 and a portion I65 spaced upwardly therefrom, the slot therebetween being in alinement with the path of counter-clockwise movement of member I52 (Figure 13) if and as member I 52 is so swung.

Bearing in mind that theoperating bar 4| (Figure 15) is of such length as to extend into the slot I21 (Figure 17) of the slide block I09 and assumes a position such as is shown in Figure 13 with the parts there shown, actuation of the bolts in the manners above described may freely take placeand during such action the upward movement of member I29, as viewed in Figures 13 and 14, moves the member I52 bodily in an upward direction, thus disengaging it from its interlocking relation to the slide block I09, spring I53 momentarily, at least, holding mem ber I52 against the shoulder I29 (Figures 13 and 19), the shoulder I29 thus preventing the spring I53 from swinging member I52 in clockwise direction beyond a position or a relative angle as shown in Figure 13. Slide member I29 and the safety member I52 thus move as a unit, retaining the angular relation therebetween as shown in Figure 13, member I52 being accommodated, when necessary during its movement, in the slot between the portions 64-I65 (Figure 17) of the slideblock I09.

But member I52 continues to project, even though moved upwardly with the slide member I29, across the longitudinal slot I21 (Figure 17) in the slide block I09, and as the latter moves to the left (as viewed in Figure 13) member I52 collides with the operating bar 4|, being swung upwardly in counter-clockwise direction thereby and being held in engagement with member 4| by spring I53. In a sense, member I52 rides over the operating bar 4| but the final locked position of the bolts brings about a relation of member I52 to operating bar 4| as shown in Figure 14, the range of relative movement being insufiicient to permit member I52 completely to ride over operating bar 4|. Restoring the bolt-operatingmechanism to bolt-withdrawn relation, brings about a reverse order of the abovedescribed steps, member I 52 swinging in clockwise direction over the operating bar 4| from the position shown in Figure 14 to the position shown in Figure 13, where it becomes again interlocked with the slide block I09.

If, however, considering the parts in the positions shown in Figure 14, the intruder has been successful in removing the key-controlled mechanism 42 (Figure 15) and has been able to withdraw the operating bar 4| from the bushing I44,

such withdrawal of the operating bar 4| (see.

now Figure 14) removes the member 4| as an obstacle to the clockwise rotation of member I52 under the action of spring I53, whereupon spring I53 immediately snaps member I52 in clockwisedirection into the slot between the pertions I56 and I55 of the slide member I09, thus immediately bringing about the interlocking relation between safety member I52 and slide block I09 as above described in detail, particularly in connection with the tumbler pin I60 (Figure 15).

If, now, the intruder inserts an instrument such as a screwdriver into the bushing slot I (Figure 16) and attempts to rotate the bushing, member I52 no longer has the position shown in full lines in Figure '14, but has assumed the interlocked position shown in dotted lines in Figure 14, member I52 now being underneath or to the left of the implement (which assumes the position of the operating member 4| in Figure 14) instead of being above the inserted implement.

Resultant rotation through the implement of the crank I46 (Figures15 and 16) proceeds only to such minor extent as is sufiicient to bring the slide block I09 in a direction toward the right, as viewed in Figure 14, where member I52, now in its downmost and interlocked relation to slide block I09, engages or contacts with the inserted implement, thus positively blocking the unlocking or retrograde actuation of the bolts. Stated differently, such attempted actuation results physically in the attempt to cause member I52 to bypass the inserted implement (represented by the member 4| for present purposes, in Figure 14) by endeavoring to cause it to under-ride the implement, something which it cannot do, rather than to over-ride it, something which it normally does with respect to the legitimate operating bar 4|.

Moreover, such actuation tends to move the member I52 in clockwise direction from its dotted line position shown in Figure 14, but such actuation is positively precluded because of the abutting relation between part I57 (Figure 20) of member I52 and part I56 (Figure 17) of the slide block I09, as well as by the positive interlocking achieved by the tumbler pin or plunger I68 (Figure These parts positively preclude any yielding of member I52 in clockwise direction from its dotted line position shown in Figure 14.

This action is analogous and in some respects similar to that which takes place with the structure above described in connection with Figures 6-12 and, if reference is now made to Figure 9, the member 10 thereof, corresponding to the member I52 of Figures 13 and 14 will be seen to be in the above-described position, namely to the left of and underneath the inserted implement S, being positively interlocked with the detent member 7! (see now Figure 11) by the plunger or tumbler pin 95 which is projected by the spring 96 into the cylindrical recess formed by the mating half cylindrical recess 79 and the upper part of recess M The dotted line position of member I52 in Figure 14 corresponds to the full line position of the safety member IQ of the construction shown in Figure 9, and broadly the safety actions, as will noW be understood, are substantially similar.

Thus, intrusion is reliably precluded.

To restore the parts to normal, after such an attempted intrusion has been made, and as is desired when a new operating bar 4| and/or a new lock mechanism 42 (Figure 15) is desired to be installed, the knob I24 is simply rotated to move the parts from the position shown in Figure 14 to the position shown in Figure 13. The new key mechanism 42 and a new operating bar ll are put in place, bar 4| extending well into the longitudinal slot IZI of the slide block I09 (Figrue 17) and being capable, as above noted, even of being extended way into the hollow knob I25 and through the sleeve I23 of the latter. The relation of parts shown in Figure 13 is thus restored, member I52 finding itself to the right of operating bar 4|, whence normal operation of the lock mechanism either through the knob I24 or the new key-controlled mechanism 42 may proceed in the manner above described in detail.

Various parts of the construction just described, such as the parts shown in Figures 17-20, for example, lend themselves readily to die-casting, thus facilitating manufacture.

It will thus be seen that there has been provided in this invention thoroughly practical and reliable means whereby unauthorized tampering with and manipulation of the bolt-operating mechanism is dependably precluded and that the arrangement lends itself to embodiment in thoroughly rugged and strong construction; moreover, it will be noted that these means lend themselves, as is typified in the several illustrative forms, readily to coaction with bolt actions and mechanisms of various kinds including, as herein illustrated by way of respective examples, a transverse bolt movement, as in the arrangement of Figures 1-5, a longitudinal bolt movement, as in the arrangements of Figures 6 and 13, and rotational bolt movements, as in the arrangements of Figures 7 and 14, and in so far as certain of the broader aspects of my invention are concerned, it is to be understood that I do not intend to limit myself, unless otherwise stated in the following claims, to any particular bolt action or movement or bolt-operating mechanism.

As many possible embodiments may be made of the above invention, and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In lock construction, in combination, a casing having a bolt and bolt-operating means therefor, means on one side of said casing for manually actuating said mechanism, means accessible from the other side 'of said casing adapted upon actuation to operate said mechanism, said lastmentioned means having an aperture for receiving therethrough the operating bar of a key-controlled means, a member moved by said mechanism extending into engagement with and on one side of an operating bar extending through said aperture and having a length sufiicient to maintain contact with said operating bar throughout its range of movement, and spring means for holding said member in contact with said operating bar and acting, upon. removal of said operating bar, to swing said member to the other side of the axis of said aperture, whereby, upon insertion of an implement or the like through said aperture, the implement blocks movement of said member and said member precludes actuation by said second-mentioned means of said mechanism.

2. A lock construction as in claim 1 provided with means whereby, after the operating bar or implement has been removed, the operation of the first-mentioned means restores said member to a position such that insertion through said aperture of an operating bar places said member on said first-mentioned side of the operating bar.

3. In lock construction, in combination, a casing having a bolt and bolt-operating means therefor, means on one side of said casing for manually actuating said mechanism, means accessible from the other side of said casing adapted upon actuation to operate said mechanism, said lastmentioned means having an aperture for receiving therethrough the operating bar of a key-controlled means, a member mounted for pivotal movement about an axis, spring means acting, during actuation of said mechanism, to swing said member about its pivot and to hold it in engagement with said operating bar and on one side thereof, whereby, upon removal of said operating bar out of said aperture, said spring means moves said member to the other side of the axis of said aperture and positions said member to move in a path, in response to subsequent attempted actuation of said mechanism by an implement projected through said aperture, to collide with said implement and block actuation of said mechanism.

4. In lock construction, in combination, a casing, a slide member slidably mounted within said casing, a bolt moved by said slide member, a key-controlled mechanism, means for moving said slide member in response to actuation of said mechanism, said means including a removable connecting element associated with said mechanism, a movably mounted member capable of assuming either of two positions, one of which is to one side of said connecting element, and means whereby movement of said slide member in bolt-retracting direction, when said movable member is on said side of said connecting element, abuts said movable member against said connecting element, thereby precluding bolt-retraction, said movable member being capable of being positioned to the other side of said connecting element, thereby to permit bolt-retraction.

5. In lock construction, in combination, a cas-' ing, a slide member slidably mounted within said casing, a bolt moved by said slide member, a key-controlled mechanism, means for moving said slide member in response to actuation of said mechanism, saidmeans including a removable connecting element associated with said mechanism, a movably mounted member capable of assuming either of two positions, one of which is to one side of said connecting element, and means whereby movement of said slide member in bolt-retracting direction, when said movable member is on said side of said connecting element, abuts said movable member against said connecting element, thereby precluding bolt-retraction, and means normally holding said movable member on the other side of said connecting element, thereby to permit bolt-retraction, but acting, upon a removal of said connecting element, to position said movable member to be moved into said abutting relation upon replacement of said connecting element.

6. In lock constructiomin combination, a bolt, key-controlled mechanism, mechanism for controlling the movement of said bolt in either looking or unlocking direction, said bolt mechanism including a connecting element related to said key-controlled mechanism, and means movable in response to actuation of said bolt mechanism but normally held in ineffective position by said connecting element and having a path of movement, when released upon removal of said connecting element, such that it collides with any member that may be substituted for said connecting element and prevents actuation of said bolt mechanism.

'7. In lock construction, in combination, a bolt, key-controlled mechanism, mechanism for controlling the movement of said bolt in either looking or unlocking direction, said bolt mechanism including a connecting element related to said key-controlled mechanism, and means responsive to actuation of said bolt mechanism and normally held ineffective by said connecting element and capable of being released by the latter, upon removal of said connecting element, into a position such that said means, when said bolt mechanism is attempted to be operated by an implement substituted for said connecting element, will collide with said substituted implement and thereby precludes operation of said bolt mechanism.

8. In lock construction, in combination, a bolt, movable means for shifting said bolt into looking or unlocking position, an operating bar, means responsive to actuation of said operating bar for actuating said movable means, and means responsive to actuation of said movable means in bolt-unlocking direction and having a path of movement such that a member that may be substituted for said operating bar would lie therein, thereby to preclude further movement thereof and movement of said movable means in boltunlocking direction.

9. In lock construction, in combination, a casing, a movable bolt, a movable slide for controlling the position of said bolt and guided for transverse sliding movement by said casing, means including a member projecting into said casing for controlling the position of said slide member, a safety member pivoted in said casing and engaging said projecting member to one side of the latter, spring means holding said safety member on said side of said projecting member and acting, upon removal of said projecting member, to move said safety member about its pivot to the other side of the axis of said projecting member, and a lost motion connection between said safety member and said slide member adapted upon actuation of said slide member in bolt-retracting direction to move said safety member, after the latter has been shifted in position by said spring upon a removal of said projecting member, against a member that may be substituted for said projecting member so as to stop movement of said slide member in bolt-retracting direction.

10. In lock construction, in combination, a casing, a movable bolt, a movable slide for controlling the position of said bolt and guided for transverse sliding movement by said casing, means including a member projecting into said casing for controlling the position of said slide member, a safety member pivoted in said casing and engaging said projecting member to one side of the latter, spring means holding said safety member on said side of said projecting member and acting, upon removal of said projecting member, to move said safety member about its pivot to the other side of the axis of said projecting member, and a lost motion connection between said safety member and said slide member adapted upon actuation of said slide member in bolt-retracting direction to move said safety member, after the latter has been shifted in position by said spring upon a removal of said projecting member, against a member that may be substituted for said projecting member so as to stop movement of said slide member in boltretracting direction, said lost motion connection having a sufiicient range of lost motion to permit freedom of actuation of said slide member throughout its desired range while said safety member is held by said spring against said projecting member.

11. In lock construction, in combination, a casing, a movable bolt, a movable slide for controlling the position of said bolt and guided for transverse sliding movement by said casing, means including a member projecting into said casing for controlling the position of said slide member, a safety member pivoted in said casing and engaging said projecting member to one side of the latter, spring means holding said safety member on said side of said projecting member and acting, upon removal of said projecting member, to move said safety member about its pivot to the other side of the axis of said projecting member, and means transmitting motion from said slide member to said safety member in a direction tomove the latter, after said spring has moved said safety member past the axis of said projecting member upon a removal thereof, into abutting relation to a member which may be substituted for said projecting member, thereby to preclude bolt-retracting movement of said slide member.

12.. In lock construction, in combination, a casing, a movable bolt, a movable slide for control- -ling the position of said bolt and guided for transverse sliding movement by said casing, means including a member projecting into said casing for controlling the position of said slide membeiga safety member pivoted in said casing and engaging said projecting member to one side of the latter, spring means holding said safety member on said side of said projecting member and acting, upon removal of said projecting member, to move said safety member about its pivot to the other side :of 'the'axis of saidpro'jectingimembeniand means responsive to movement of said safety member to said other side of said axis for blocking movement of said slide member.

13. In :lock construction, in combination, a casing, a 'movable'bolt, a movable -slide for controlling the position of said bolt and guided for transverse sliding movement by said casing, means including a member projecting into said casing for controlling 'the position of said slide member, a safety member pivoted in said casing and engaging said projecting member to one side of the latter, spring means holding said safety member on said side of said projecting member and acting, upon removal of said projecting member, to move said safety member about its pivot to the other side of the axisof said projecting member, 'means for latching said safety member upon the conclusion of its said movement in response to said spring, and. means whereby said latched safety member precludes movement of said slide member.

14. Indock construction, "in combination, a casing, a movable bolt, a movable slide for controlling the'position-of saidbolt and guided for transverse slidingmovementby said casing, means including amember projecting :into said casing for controlling the position of said slide member, a safety member pivoted-in said casing and engaging said projecting member to one side of the latter, spring means holding said safety member on said side of said projecting member and acting, upon removal of said projecting member, to move said safety member about its pivot to the other side of the axis of said projecting member, means for latching said safety member upon the conclusion of its said movement in response to said spring,and an abutment against which said slide member rests when in one position, said safety member having means positioned, when in latched position, to engage at least part of said slide member to hold it against said abutment.

15. In lock construction, in combination, a bolt, key mechanism, mechanism for controlling the movement of said bolt in either locking or :unlocking direction, said bolt mechanism including a connecting element related to said key mechanism, means movable in response to actuation of said bolt mechanism but normally held in ineffective position by said connecting element and having a pathef movement, when released upon removal of said connecting element, such that it collides with any member that may be substituted for said connecting element so as to prevent actuation of said bolt mechanism, and additional meansfor operating said bolt mechanism and acting through the latter to restore said movable means.

16. In lock construction, in combination, a casing having front and back walls each 'having rotatably mounted therein a crank, :a bolt, a member slidable transversely-of said casing and guided thereby for-actuating said bolt, said slidable member having two spaced parts between which either of said cranks, upon rotation thereof, may engage for controlling the imovement of said slidable member, said two spaced parts being spaced in a direction transversely of said casing, a spring opposedhead slidably-carried by said slidable member for 'movement lengthwise of said casing and between said two spaced parts and normally projected outwardly therefrom, said head being positioned in the path of travel of either of said cranks upon rotation thereof, and abutment means carried by at least one of said walls of said "casing and coacting with said head when projected to hold said slidable'member against movement, said abutment means being dimensioned so that said head, when moved inwardly :between said parts by either of said cranks Joy-passes said abutment means and thereby permit movement of saidslidable member by "a crank.

17. in look construction,'inncombination, a casing having front and back walls each having rotatably mounted therein "a crank, a bolt, a member slidable transversely "of said casing and guided thereby for actuating "said bolt, said slidable member having two spaced parts between which either of said'cranks, upon rotation thereof, may engage for controlling the movement of said slidable member, said two spaced parts being spaced in a direction transversely of said casing, a spring-opposed head slidably carried by said slidable member for movement lengthwise of said casing and between said two spaced parts and normally projected outwardly therefrom, said head being positioned in the path of travel of either of said cranks upon rotation thereof, and a single abutment on a wall oi -said casing "coacting with said head, said abutment being dimensioned in the direction of movement of said head such that the head disengages said abutment upon being pressed inwardly between said parts by a crank, whereupon sliding movement of said slide :may "take place, and being dimensioned'in the-direction of sliding movement of said slidable member such that "the head en- 'ga'ges to one side of said abutment when said slidable member is at one extreme of its movement and'engages at the'other'side of said abutment when said slidable member is at the other extreme.

18. In lock construction, in combination, a casing having front 'and back walls eac'hihaving rotatably mounted therein a crank, a bolt, a member slidable transversely of said casing and guided thereby for actuatingsaid bolt,*said slidable member having two space-d parts between which either of said cranks, up'on rotation thereof, may engage forcon'trolling the movement of said slidable member, said two spaced parts being spaced in a direction transversely of said casing, a spring-opposed head slidably carried by said slidable member for movement lengthwise of said casing andbetween 'sai-d'two spaced parts and normally projected outwardly therefrom, said head being positioned in the path of travel of either of said cranks upon rotation thereof, said slidable member having a bore extending lengthwise of said spaced parts and exposed in the'space between the latter and said head having a shank slidably received in said bore, the spring opposing said head being housed in said bore and acting against said shank, and abutment means carried by at least one of said walls of said casing and coacting with said head when projected tohold said slidable member against movement, said abutment means being dimensioned so that said head, when moved inwardly between said parts by either of said cranks bypasses said abutment means and thereby permits movement of said slidable member by a crank.

19. In lock construction, in combination, a casing having a bolt, slidable means guided within said casing for actuating said bolt, said casing having abutment means adjacent the path of movement of said slidable means, a member slidably mounted upon said slidable means for movement transversely of the latter and adapted to .coact with. said abutment means to .limit the movement of said slidable means, an apertured member movably carried by said casing for actuating said slidable means, a member projected through the aperture in said apertured member for actuating the latter, and movable means responsive to movement of said slidable means normally engaging said projected member and held by the latter in ineffective position, and spring means for moving said movable means to the other side of said projected member upon removal of the latter out of its aperture, whereby movement of said movable means in response to attempted actuation of said slidable means in response to operation of a member inserted into said aperture in place of said projected member is stopped by said inserted member and movement of said slidable means thereby precluded.

20. In lock construction, in combination, a

casing having a bolt, slidable means guided within said casing for actuating sai-d bolt, said casing having abutment means adjacent the path of movement of said slidable means, a member slidably mounted upon said slidable means for movement transversely of the latter and adapted to coact with said abutment means to limit the movement of said slidable means, an apertured member movably carried by said casing for actuating said slidable means, a member projected through the aperture in said apertured member for actuating the latter, a safety member pivotally carried by said slidable'member'and having means for holding it against said projected member when said slidable'means is in bolt-projected position, said holding means acting, upon a withdrawal of said projected member to swing said safety member past the position occupied by said -projected member prior to the withdrawal of the latter, thereby positioning said safety member 4.0 to be moved into collision with a device which may be inserted through said aperture in place of said withdrawn projected member, thereby to cause said device to block withdrawal-actuation of said bolt.

21. In lock construction, in combination, a casing having a bolt, slidable means guided within said casing for actuating said bolt, said casing having abutment means adjacent the path of movement of said slidable means, a member slidably mounted upon said slidable means for movement transversely of the latter and adapted to coact with said abutment means to limit the movement of said slidable means, a crank arm pivotally carried by said casing adapted upon rotation to coact with said slidable member to disengage it from said abutment means and move said slidable means and thereby actuate the bolt, said crank arm having an aperture at its axis for receiving an operating member for rotating the crank arm, said slidable member being moved by said crank from one side ofthe axis thereof to the other, means pivotally carried by said slidable member and movable therewith from one side of said axis to the other, said pivotal means having a spring'for holding it in engagement with said operating member when said slidable means and bolt are in bolt-projected position, whereby upon removal of said operating member, said pivotal member is moved into a position to prevent movement of said slidable member toward the other side of said axis.

22. In lock construction, in combination, a casing having a projectable and rotatable bolt, said bolt having a shank with a round head at its inner end, slidable means guided within said casing for movement in the direction of projection of said bolt, said slidable means having bearing means for rotatably and slidably supporting and peripherally engaging said round head at the inner end of the shank of said bolt and having :5 means engaging the shank between the bolt and the head, whereby relative motion of translation between said bolt and said slidable means may take place, means for moving said slidable means in bolt-projecting direction, means preventing 10 rotation of said bolt during a portion of said movement of said slidable means, and means effective during the remaining portion of said movement of said slidable means for rotating said bolt. 15

23. In lock construction, in combination, al casing having a projectable and rotatable bolt, said bolt having a shank with a round head at its inner end, slidable means guided within said casing for movement in the direction of projec- 20 tion of said bolt, said slidable means having bearing means for rotatably and slidably supporting and peripherally engaging said round head at the inner end of the shank of said bolt and having means engaging the shank between the bolt and 25 the head, whereby relative motion of translation between said bolt and said slidable means may take place, means for moving said slidable means, and means operative to effect relative motion of translation between said bolt and said slidable 30 means to take place only after a certain movement of said slidable means in bolt-projecting direction has taken place.

24. In lock construction, in combination, a casing having a projectable and rotatable bolt, said bolt having a shank with a round head at its inner end, slidable means guided within said casing for movement in the direction of projection of said bolt, said slidable means having bearing means for rotatably and slidably supporting and 40 peripherally engaging said round head at the inner end of the shank of said bolt and having means engaging the shank between the bolt and the head, whereby relative motion of translation between said bolt and said slidable means may take place, means controlled from the exteriorof said casing for moving said slidable means, a connection between said slidable means and said bolt for effecting rotation of said bolt upon relative movement of translation between said bolt and 50 said slidable means, and means for controlling the point in the movement of said slidable means at which said relative motion of translation is to take place.

25. In lock construction, in combination, a casing having a projectable and rotatable bolt, said bolt having an inner end provided with a shank and a head, a slide block within said casing, said slide block having a recess within which said bolt head is rotatably received, means for moving said slide block and for effecting rotation of said bolt, a retaining plate member for locking said head within said recess, and means for holding said plate member to said block comprising an interfitting dovetail and groove. 69

26. In lock construction, in combination, a casing having a projectable and rotatable bolt, said bolt having an inner end provided with a shank and a head, a slide block within said cas- P ing, said slide block having a recess of greater depth than the length of said head and Within which recess said bolt head is slidably and rotatably received, means for moving said slide block and for efiecting rotation of said bolt, a retaining member for locking said head in said recess and 75 

